Prometheus 3.0.0
← All Prometheus releases · Searchable index of all 692 changes
Changelog
| PR / issue | Type | Description |
|---|---|---|
| #15376 | Change | Set the GOMAXPROCS variable automatically to match the Linux CPU quota. Use --no-auto-gomaxprocs to disable it. The auto-gomaxprocs feature flag was removed. |
| #15373 | Change | Set the GOMEMLIMIT variable automatically to match the Linux container memory limit. Use --no-auto-gomemlimit to disable it. The auto-gomemlimit feature flag was removed. |
| #15136 | Change | Scraping: Remove implicit fallback to the Prometheus text format in case of invalid/missing Content-Type and fail the scrape instead. Add ability to specify a fallback_scrape_protocol in the scrape config. |
| #15219 | Change | Remote-write: default enable_http2 to false. |
| #15164 | Change | Scraping: normalize "le" and "quantile" label values upon ingestion. |
| #15178 | Change | Scraping: config scrape_classic_histograms was renamed to always_scrape_classic_histograms. |
| #14657 | Change | Config: remove expand-external-labels flag, expand external labels env vars by default. |
| #13883 | Change | Disallow configuring AM with the v1 api. |
| #14505 | Change | regexp . now matches all characters (performance improvement). |
| #14930 | Change | holt_winters is now called double_exponential_smoothing and moves behind the experimental-promql-functions feature flag. |
| #14894 | Change | API: The OTLP receiver endpoint can now be enabled using --web.enable-otlp-receiver instead of --enable-feature=otlp-write-receiver. |
| #14160 | Change | Prometheus will not add or remove port numbers from the target address. no-default-scrape-port feature flag removed. |
| #14906 | Change | Logging: the format of log lines has changed a little, along with the adoption of Go's Structured Logging package. |
| #14738 | Change | Don't create extra _created timeseries if feature-flag created-timestamp-zero-ingestion is enabled. |
| #15111 | Change | Float literals and time durations being the same is now a stable fetaure. |
| #14872 | Change | UI: The old web UI has been replaced by a completely new one that is less cluttered and adds a few new features (PromLens-style tree view, better metrics explorer, "Explain" tab). However, it is still missing some features of the old UI (notably, exemplar display and heatmaps). To switch back to the old UI, you can use the feature flag --enable-feature=old-ui for the time being. |
| #13904 | Change | PromQL: Range selectors and the lookback delta are now left-open, i.e. a sample coinciding with the lower time limit is excluded rather than included. |
| #14365 | Change | Kubernetes SD: Remove support for discovery.k8s.io/v1beta1 API version of EndpointSlice. This version is no longer served as of Kubernetes v1.25. |
| #14365 | Change | Kubernetes SD: Remove support for networking.k8s.io/v1beta1 API version of Ingress. This version is no longer served as of Kubernetes v1.22. |
| #14705 | Change | UTF-8: Enable UTF-8 support by default. Prometheus now allows all UTF-8 characters in metric and label names. The corresponding utf8-name feature flag has been removed. |
| #14807 | Change | Console: Remove example files for the console feature. Users can continue using the console feature by supplying their own JavaScript and templates. |
| #14770 | Change | SD: Enable the new service discovery manager by default. This SD manager does not restart unchanged discoveries upon reloading. This makes reloads faster and reduces pressure on service discoveries' sources. The corresponding new-service-discovery-manager feature flag has been removed. |
| #14747 | Change | Agent mode has been promoted to stable. The feature flag agent has been removed. To run Prometheus in Agent mode, use the new --agent cmdline arg instead. |
| #13456, #14526 | Change | Remove deprecated remote-write-receiver,promql-at-modifier, and promql-negative-offset feature flags. |
| #14640, #14643 | Change | Remove deprecated storage.tsdb.allow-overlapping-blocks, alertmanager.timeout, and storage.tsdb.retention flags. |
| #15384 | Feature | OTLP receiver: Ability to skip UTF-8 normalization using otlp.translation_strategy = NoUTF8EscapingWithSuffixes configuration option. |
| #14769 | Feature | Support config reload automatically - feature flag auto-reload-config. |
| #14710 | Enhancement | Scraping, rules: handle targets reappearing, or rules moving group, when out-of-order is enabled. |
| #15196 | Enhancement | Tools: add debug printouts to promtool rules unit testing |
| #14694 | Enhancement | Scraping: support Created-Timestamp feature on native histograms. |
| #14898, #14899, #14907, #14908, #14912, #14913, #14914, #14931, #14940, #14945, #14946, #14972, #14981, #14982, #14994, #15096 | Enhancement | UI: Many fixes and improvements. , , , , , , , , , , , , , , |
| #15082 | Enhancement | UI: Web UI now displays notifications, e.g. when starting up and shutting down. |
| #14677 | Enhancement | PromQL: Introduce exponential interpolation for native histograms. |
| #14850, #14546 | Enhancement | TSDB: Add support for ingestion of out-of-order native histogram samples. |
| #13909 | Enhancement | Alerts: remove metrics for removed Alertmanagers. |
| #14929 | Enhancement | Kubernetes SD: Support sidecar containers in endpoint discovery. |
| #11224 | Enhancement | Consul SD: Support catalog filters. |
| #14875 | Enhancement | Move AM discovery page from "Monitoring status" to "Server status". |
| #14975 | Performance | TSDB: Parallelize deletion of postings after head compaction. |
| #14932 | Performance | TSDB: Chunk encoding: shorten some write sequences. |
| #14721 | Performance | TSDB: Grow postings by doubling. |
| #12180 | Performance | Relabeling: Optimize adding a constant label pair. |
| #15341 | Bug fix | UI: fix selector / series formatting for empty metric names. |
| #14941 | Bug fix | PromQL: Fix stddev+stdvar aggregations to always ignore native histograms. |
| #14941 | Bug fix | PromQL: Fix stddev+stdvar aggregations to treat Infinity consistently. |
| #15251 | Bug fix | OTLP receiver: Preserve colons when generating metric names in suffix adding mode (this mode is always enabled, unless one uses Prometheus as a library). |
| #15095 | Bug fix | Scraping: Unit was missing when using protobuf format. |
| #14910 | Bug fix | PromQL: Only return "possible non-counter" annotation when rate returns points. |
| #14854 | Bug fix | TSDB: Chunks could have one unnecessary zero byte at the end. |
| #14884 | Bug fix | "superfluous response.WriteHeader call" messages in log. |
| #14821 | Bug fix | PromQL: Unary negation of native histograms. |
| #15025 | Bug fix | PromQL: Handle stale marker in native histogram series (e.g. if series goes away and comes back). |
| #14947 | Bug fix | Autoreload: Reload invalid yaml files. |
| #11029 | Bug fix | Scrape: Do not override target parameter labels with config params. |
Reproduced from the official Prometheus 3.0.0 release notes. Last checked 8 Oct 2026, 13:19 UTC.